Preheat your oven to 350°F (175°C). Line a 12-cup muffin tin with liners or grease it lightly. Rookie mistake: don’t skip this, unless you like muffin-shaped rocks.
Mix dry ingredients: In a bowl, whisk together flour, baking soda, and salt. Easy, right?
Mash the bananas in a separate bowl until mostly smooth. It’s therapeutic—embrace the mess.
Combine wet ingredients: Add melted butter, brown sugar, egg, and vanilla to the bananas. Stir until you get a creamy, golden mixture.
Fold in dry ingredients gently. Overmixing = tough muffins. Nobody wants that.
Add chopped nuts, reserving a few for topping. Fold just until evenly distributed.
Spoon batter into the muffin tin, filling about ¾ full. Sprinkle remaining nuts on top for bonus crunch.
Bake 20–25 minutes, or until a toothpick inserted comes out clean. Let them cool a few minutes before diving in.